Diwali (also spelled Devali in certain regions) or Deepavali, popularly known as the "festival of lights," is primarily a five day Hindu festival which starts on Dhanteras, celebrated on thirteenth lunar day of Krishna paksha (dark fortnight) of the Hindu calendar month Ashwin and ends on Bhaubeej, celebrated on second lunar day of Shukla paksha (bright fortnight) of the Hindu calendar month Kartik.
(wikipedia) 
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